Alert archive / Minnesota / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 134, NWS Twin Cities, MN
NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 15, 1999, 9:04 PM CDT for Todd County, Minnesota. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 15, 1999, 9:04 PM CDT (02:04 UTC)
- Expired
- Jul 15, 1999, 9:45 PM CDT
- In force
- 41 min
- Issued by
- NWS Twin Cities, MN
- Area
- Whole counties
County Todd County, MN
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 2.1 hours before the alert went out and 169 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1119 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 1812 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 113 m²/s²
- 0-3 km storm-relative helicity
- 204 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 7.3
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KMPX 160205 RRA SVRMSP MNC153-160245- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TWIN CITIES-CHANHASSEN MN 904 PM CDT THU JUL 15 1999 THE NATIONAL WEATHER SERVICE IN TWIN CITIES-CHANHASSEN MN HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN TODD COUNTY IN CENTRAL MINNESOTA * UNTIL 945 PM CDT * AT 904 PM CDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM WITH LARGE HAIL 3 MILES NORTH OF EAGLE BEND... OR ABOUT 18 MILES NORTHWEST OF LONG PRAIRIE...MOVING NORTHEAST AT 35 MPH. * SOME LOCATIONS AFFECTED BY THIS STORM INCLUDE... EAGLE BEND CLARISSA BERTHA PHILBROOK THIS IS A DANGEROUS STORM WITH LARGE HAIL..\.STAY INDOORS AWAY FROM WINDOWS.
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Twin Cities, MN wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 15, 8:50 PM CDT, 14 minutes earlier.
Area forecast discussion, Jul 15, 8:50 PM CDT, 14 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN 850 PM CDT THU JUL 15 1999 THUNDERSTORMS CONTINUING TO DEVELOP/MOVE NORTHEAST ACROSS THE WESTERN FRINGE OF THE CWA THIS EVENING. EVENING UPPER AIR SHOWING 35-40 KT UNIDIRECTIONAL FLOW IN THE LOW AND MID LEVELS. KOAX AND KMSP RAOBS ALMOST IDENTICAL IN SHOWING DRY LAYER BETWEEN 700 AND 500 MB. THIS HAS CUT THE PWATS BACK TO NEAR AN INCH BUT BELIEVE LAPS SOUNDING DATA NEAR STORMS OF 2 INCHES MORE REALISTIC. SEVERAL FEATURES TO KEY ON OVERNIGHT. FIRST IS STRONG H8 CONVERGENCE-H3 DIVERGENCE COUPLET THAT IS INDICATED THRU THE NIGHT OVER SOUTHEASTERN SD AND EASTERN NE. THIS AREA IS ALSO IN AN AREA OF STRONGLY DIFLUENT THICKNESS. BUFKIT MBE VELOCITY FOR SW MN SHOWS ONLY A FEW KNOTS FROM THE NORTHEAST OVERNIGHT. IT WOULD SEEM THAT TRAINING/BACK BUILDING STORMS WILL BE THE RULE EARLY TONIGHT FROM W CNTRL MN ON SW INTO EASTERN NE. WOULD EXPECT THUNDERSTORMS DEVELOPING OVER SOUTHEAST SD AND NORTHEAST NE TO GEL INTO A RATHER LARGE COMPLEX BY MIDNIGHT WITH TORRENTIAL RAINS. THIS PLAYS HAVOC WITH THE ZONES AS THUNDERSTORMS WILL BE SLOW TO DEVELOP INTO EASTERN MN/WESTERN WI AS THE SHORT WAVE ENERGY SHEARS OUT. WITH THE EVENING UPDATE WILL HAVE THE HIGHEST POPS OVERNIGHT OVER THE W WITH JUST CHANCE POPS IN THE E AND S. WILL KEEP MENTION OF SEVERE OVER THE WEST AS WIND DAMAGE POTENTIAL HIGH. .MSP...NONE. HILTBRAND
Nearby
Severe Thunderstorm Warnings in Minnesota, 1999Every severe thunderstorm warning in 1999
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.